" Naturalists now look upon the study of varieties as more important 

 than that of well-fixed species. It is in the former that we see nature still 

 at work, in the very act of producing those wonderful modifications of form, 

 that endless variety of colour, and that complete harmony of relations, which 

 (gratify every sense and give occupation to every faculty of the true lover of 



nature." 



A. R. WALLACE. 



